restaurant_bloc.dart

class RestaurantBloc implements BlocBase {
  RestaurantBloc() {
    chef.stream.listen(cookOrder);
  }

  String currentOrder;

  final waiter = StreamController();
  Sink get tray => waiter.sink;
  Stream get deliverFood => waiter.stream;

  final chef = StreamController();
  Stream get customerOrders => chef.stream;

  cookOrder(customerOrder) {
    currentDoor = customerOrder.cook();
    tray.add(customerOrder);
  }

  @override
  void dispose() {
    chef.close();
    waiter.close();
  }
}